Rotary offset printing machines with shiftable blankets



1954 w. RITZERFELD ETAL 3,156,182

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS l1 Sheets-Sheet1 Filed Nov. 25, 1962 ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLEBLANKETS Jn ven fars NOV. 1964 w. RITZERFELD ETAL 3,156,182

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 23,1962 ll Sheets-Sheet 5 Fly. 3

10, 1964 w. RITZERFELD ETAL 3,

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS ll SheetsSheet 4Filed NOV. 23, 1962 1964 w. RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed NOV. 25,1962 ll Sheets-Sheet 5 10, 1954 w. RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 25,1962 11 Sheets-Sheet e Fig.6

10, 1964 w. RlTZERFELD ETAL 3,156,183

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 25,1962 11 Sheets-Sheet 7 1964 w. RITZERFELD ETAL 3, 5 8

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKET-S ll Sheets-Sheet8 Filed Nov.

RN QNN SN .70 venfors AM; a wa /kw flv /M T964 :RITZERFE'LID FETAL 5,

ROTARY OFFSET PRINTING 'M'A'CHJLNES WITH "SELF-TABLE .BLANKETS FiledNOV. 23, 1962 '11 Sheets-Shem 9 Fig.9

Nov. 10, 1964 W. RITZERFELD ET AL ROTARY OFFSET PRINTING MACHINES WITHSHIFTABLE B LANKETS Filed Nov. 23, 1962 ll Sheets-Sheet l0 Nov- 1964 w.RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 23,1962 ll Sheets-Sheet 11 a 1 E? Y I E\ S s 5? a N Q l IE :l .F Tl J, .L 2

Jnvemors W M f /7 %%M {JAM United States Patent 3,156,182 ROTARY OFFSETPRINTENG MACHINES WITH Sl-HFTABLE ELANKETS Wilhelm Ritzerfeld,Schorlemer Aliee 14, Berlin-Bahlem, Germany, and Gerhard Ritzerfeld,Franzenshader Strasse 21, Berlin-Grunewald, Germany Filed Nov. 23, 1962,Ser. No. 239,702 (Ilaims priority, application Germany, Nov. 23, 1961, R31,528, R 31,529 34 Claims. (Cl. 1tll142) The present invention relatesto an offset printing machine with a shiftable blanket, and moreparticularly to an offset printing machine which permits the printing ofselected lines of a text on a copy sheet adjacent the imprint of thehead section of a text.

Offset printing machines according to the prior art have thedisadvantage that heavy offset inks cause an adherence of the copy sheetto the offset roller so that it is difficult to maintain the copy sheetat a standstill during a selective printing operation in which theoffset blanket has to be repeatedly separated from the copy sheet.

Another disadvantage of the prior art construction is that substantialmasses have to be operated for separating the offset blanket from theprinting form and from the copy sheet.

It is one object of the present invention to overcome the disadvantagesof known offset printing machines, and to provide an offset printingmachine which reliably operates during selective printing operations inwhich the copy sheet is stopped.

Another object of the present invention is to provide offset printingmachines of simple construction for the purpose of the printing ofselected lines or parts of the text of a printing form.

Another object of the invention is to provide offset printing machinespermitting printing of selected lines of a text section of the printingform on a copy sheet adjacent the head section of a printing form.

Another object of the present invention is to provide offset printingmachines in which the blanket of the offset roller or cylinder isstepwise shifted after each revolution so that a different part or lineof the transferred copy of a text section is located on a particularsection of the periphery of the offset roller, and preferably adjacentthe transferred copy of the head section or" the printing form.

Another object of the present invention is to provide offset printingmachines with an offset roller having a fixed blanket for the headsection of a printing form, and a shiftable blanket for the text sectionof the printing form.

Another object of the present invention is to shift the shiftableblanket of an offset printing machine in such a manner that one orseveral lines of the text can be selectively imprinted on the copysheet.

Another object of the invention is to provide an offset printing machinefor printing on copy sheets of the same size, a head section of the samelength, and selected fixed sections of different lengths.

With these objects in View, one embodiment of the invention comprisesfirst roller means, and holder means for holding a printing form, andpreferable second holder means for holding a copy sheet on peripheralsurfaces defined by the first roller means; second roller meansincluding an offset roller, blanket means having a peripheral portionlocated on the surface of the offset roller, and transporting means fortransporting the blanket means so that the peripheral portion isshifted; supporting means supporting the roller means for movementbetween a transfer position cooperating for transferring a copy of theice printing form to the peripheral portion of the blanket means, aprinting position in which the roller means cooperate for printing bythe peripheral portion of the blanket means at least part of thetransferred copy on a copy sheet, and preferably a neutral position inwhich the first and second roller means are spaced from each other;operating means for moving the roller means between the above-mentionedpositions; and control means including selected means for operating thetransporting means blanket parts carrying copies of selected parts of vthe printing form are positioned for printing on a copy sheet.

In accordance with the present invention, the control means are operatedafter each revolution of the oifset roller so that the blanket means isshifted and different parts of a transferred copy are printed onsuccessive copy sheets, preferably in the same position and on the samepart of the copy sheet. In the preferred embodiment of the invention,the blanket means include a fixed peripheral portion on the offsetroller, and the fixed peripheral portion is used to receive atransferred copy of the head section of the printing form, and to printthe head section on the copy sheet. The shiftable peripheral blanketportion is shifted in such a manner that the imprint of the selectedpart of the text section is located adjacent the imprint of the headsection, irrespective of how far the selected part of the text sectionis spaced from the head section on the printing form.

In the preferred embodiment of the invention, the offset roller ishollow, and the shiftable blanket means is drawn into the interior ofthe offset roller by a stepping mechanism. The stepping mechanism isactuated during each revolution of the offset roller by engagementbetween an actuating member of the stepping mechanism, and a stationarycontrol member which projects into the circular path of movement of theactuating member of the stepping mechanism. If only one control memberis provided, the blanket will be shifted after each revolution, so thatsuccessive lines of the text section will be imprinted on the copysheet.

In a preferred embodiment of the invention, a plurality of controlmembers is provided about the periphery of the offset roller, and eachcontrol member can be selectively moved by a selector member to anoperative position located in the circular path of movement of theactuating member of the stepping mechanism so that the shifting of theblanket means displaces the blanket means corresponding to a number oflines of the text section which can be selected by the operator.

Such selection is preferably carried out by moving selected controlmembers from a normal inoperative position to an operative position byelectro-magnetic means in the circuits of which selector switches arelocated. The selector switches are respectively associated with selectormembers which are keys of a key board used by the operator to select oneor several lines of the text for printing during successive revolutionsof the offset roller, a new copy sheet being fed to the bight of theoffset roller after each revolution. According to one embodiment of theinvention, the offset roller cooperates with a main roller on which theprinting form is mounted, and with the counter pressure roller.Electro-magentic operating means shift the offset roller between thetransfer position co operating with the printing form on the mainroller, a printing position cooperating with the copy sheet on thecounter pressure roller, and a neutral position spaced from bothrollers. The movement between the neutral position of the printingposition is only carried out when a selected line of the transferredcopy of the text section is located in the printing line between theoffset roller and the counter pressure roller.

If it is intended to print the entire text section, the olfset roller ismaintained in its neutral position, and the counter pressure roller ismoved to a printing position cooperating with the offset roller and heldin this printing position until the entire text is printed on a copysheet held by a holder on the counter pressure roller.

In a modified construction, the olfset roller is only moved between aneutral position and a transfer position, and the printing of at least apart of the copy of the text section on the blanket on the copy sheet isobtained by moving the counter pressure roller to and from the printingposition under control of rotary cams running in synchronism with theoffset roller.

Another embodiment of the invention eliminates the counter pressureroller, and the offset roller cooperates with a main roller having firstholder means for holdling a printing form on one part or segment of theperipheral surface thereof, and a second holder means for holding a copysheet on another part or segment of the peripheral surface of the mainroller. The offset roller successively cooperates with the printing formand the copy sheet during each revolution of the main roller, andconsequently has substantially half the diameter of the main roller.

During the first part of the revolution of the main roller, a copy ofthe head section of the printing form is transferred to the fixedperipheral portion of the blanket means, and a copy of the entire textsection of the printing form is transferred to the shiftable peripheralportion of the blanket means on the oifeset roller. During the secondpart of the revolution of the main roller, the offset roller is moved toa printing position only when the fixed blanket forms a printing linewith the copy sheet, and when a selected part of the copy of the textsection on the blanket means passes through the printing line with thecopy sheet.

Successive lines of the text section may be printed during consecutiverevolutions of the main roller, while a new copy sheet is fed to themain roller after each revolution thereof. During each successiverevolution, the head section of the printing form is brought intocontact with the fixed portion of the blanket to transfer again a copyof the head section to the fixed blanket portion, which is necessarysince the head section is printed on each newly fed copy sheet. Sincedifferent parts of the text section are printed on successive copysheets, the copy of the text section is only once transferred from theprinting form to the shiftable peripheral portion of the blanket.

The shifting of the blanket after each revolution is again obtained bystepping mechanism under control of control members which can beselectively placed in the path of the actuating member of the steppingmechanism. A key board is provided for this purpose. In all embodimentsof the invention, the movement of the offset roller is controlled byrotary contact arm successively engaging contacts which are connected tothe selector switches, so that the movement of the olfset roller issynchronized with the shifting of the blanket.

While in the preferred embodiments of the invention, the offset rolleris moved between inoperative and operative positions by electro-magneticoperating means, it is also contemplated to use rotary cam-s for thispurpose.

In all embodiments of the invention, the circuit of the electro-magneticcontrol and operating means includes relays which bridge the respectivecircuit parts so that a continuous cooperation between the oifset rollerand the main roller carrying the printing form can be obtained for thepurpose of producing prints of the entire text section, in addition tothe head section.

The preferred embodiment of the invention, in which the printing formand the copy sheet are located on a main roller whose shaft isstationary, has the advantage that the inking devices and moisteningdevices can also be made stationary, and that the offset cylinder, whichhas to be moved between inoperative and operative positions can be madesmall so that very small masses have d to be moved when the offsetcylinder is moved toward the main roller or away from the same.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together With additional objects and advantages thereof willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings, inwhich:

FIG. 1 is a side elevation, partly in cross section, with the walls ofthe machine omitted for the sake of clarity, and illustrating a firstembodiment of the invention;

FIG. 2 is a cross sectional view illustrating a first embodiment of theblanket construction for the embodiment of FIG. 1 on an enlarged scale;

FIG. 3 is a fragmenary plan view of the embodiment of FIG. 1;

FIG. 4 is a cross sectional view illustrating on an enlarged scale, anoffset roller with a modified blanket construction which may be used inthe embodiment of FIG. 1;

FIG. 5 is a fragmentary side elevation illustrating operating andcontrol means for the embodiment of FIG. 1 on an enlarged scale;

FIG. 6 is a diagram illustrating the electric circuit of the embodimentof FIG. 1;

FIG. 7 is a fragmentary schematic side view partially in cross section,illustrating a modification of the embodiment of FIG. 1 in which thecounter pressure roller is shifted;

FIG. 8 is a fragmentary side view, partially in cross section,illustrating a second embodiment of the invention, the side wall of themachine being omitted for clarity;

FIG. 9 is a fragmentary cross sectional view illustrating the offsetroller of the embodiment of FIG. 8 on an enlarged scale;

FEG. 10 is a plan View of the embodiment of FIG. 8; and

FIG. 11 is a diagram illustrating the electric circuit of the embodimentof FIG. 8.

Referring now to the drawings, and more particularly to FIGS. 1 to 4,main roller 1 is mounted on a shaft 3 and has a holding means forholding on the periphery thereof the printing form 2. Shaft 3 iscontinuously rotated by a motor, not shown. A moistening deviceincluding rolls to 6, and a container 7, and an inking device includingrollers 8 to 12 and an ink supply means 13, cooperate with the printingform 3 to prepare the same for the printing process.

An offset roller 14- is mounted on a shaft 115, and is driven insynchronism with the rotation of main roller 1 by the gear train 16, l7,l8 and 19 which is only schematically indicated by chain line in FIGS.1, 2 and 3 for the sake of clarity.

A counter pressure roller 26 is mounted on a shaft 21, and iscontinuously driven through a gear train 22, 23, 2 4 from gear 19 whichis secured to the shaft 15 of offset roller 14.

Shaft 21 is mounted on lever means 116 which can be rocked about a shaft117 in the direction of the arrows D, C in FIG. 1, and which can bearrested in two positions by engagement between a spring-loaded catch11.3, and two notches 119 and 126* in lever means 11.6. A pair ofstationary stops define the two shifted positions of lever means 116,and thereby two positions of the counter pressure roller 20 which ismovable with lever mean 116 to a position advanced toward offset roller14 as indicated in FIG. 1 by chain lines.

Counter pressure roller 2i has a holding means 56 for holding a copysheet. Copy sheets 55 are automatically supplied to holding means 56 byfeeding means 54. The feeding operation is conventional, and not anobject of the present invention.

The offset roller 14- has rubber blanket means including a fixed blanket25 which is held by two clamping members 55a, located in recesses of thehollow offset roller 14, and holding the fixed blanket on acorresponding, comparatively short peripheral surface portion of offsetroller 14. Instead of clamping blanket 25 to the offset roller, theblanket 25 may be permanently vulcanized to the peripheral surface ofthe offset roller.

Offset roller 14 is provided with a movable rubber blanket 26 whichpasses through slots in the peripheral Wall of offset roller 14 into theinterior of the same so that only a portion of blanket 26 is located onthe peripheral surface of oifsetroller 14. One end of blanket 26 issecured to a take-up reel 27, and the other end of blanket 26 is securedto a let-off reel 48, both reel being mounted in the interior of theoffset roller. Guide roller 46 and 47 guide the movable blanket from theperiphery of offset roller 14 toward reels 2'7 and 48. A gear 3% isturnable on shaft 15, and meshes with a pair of gears 28 and 31 whichare respectively secured to reels 27 and 48. Gear 313* meshes with agear 29 which is secured to a ratchet wheel 32, and to a common shaft 34which is mounted in the side walls of offset roller 14. A pawl 35,turnable on a pin 36, is biased by a spring 37 to hold ratchet wheel 32.On one side wall of offset roller 14-, a shifting pawl 38 is mountedturnable about a pin 39, and is biased by spring 40 to engage a stop 41.Shifting pawl 38 has a free end carrying a roll 42 which cooperates withone or several control members 43 during rotation of offset roller 14,as will be described hereinafter in greater detail.

Whenever shifting pawl 33 is actuated by a control member 43 against theaction of spring 46, ratchet 32 turns one step while raising pawl 35against the action of spring 37. A transporting sprocket 44 on shaft 34turns with ratchet 32, and engages perforations 4 1a along onelongitudinal edge of blanket 26 which is supported on the other side bya transporting roller 45. Gears 28 to 31 turn simultaneously so thatblanket 26 is shifted one step and wound up on the take-up reel 27,while being unwound from the let-off reel 48.

Shaft is mounted in lever means 49 which are turnable about a shaft 5thfor moving offset roller 14 toward and away from main roller 1 andcounter pressure roller 20. The two lever arms 49 have aligned bores inwhich an eccentric shaft 51 is turnably mounted. Shaft 51 is supportedin bearings on the side walls of the frame of the machine, and fixedlyconnected to a lever 52 which can be rocked for efiecting rockingmovement of lever means 49 in the direction of the arrow B, C in FIG. 5.

The end of lever 52 has a slot into which a pin 76 of a shiftable member75 projects. A spring 79 is secured to lever 52 and to a fixed pin 80,and tend to hold lever 52 in a neutral position, not illustrated, inwhich offset roller 14 is spaced from main roller 1 and counter pressureroller 21?. Two electro-magnetic means 78 and 81, see also FIG. 6 havearmature members 77 and 82 connected to the connecting member 75. Whenelectromagnetic means 81 is energized, lever 52 is shifted to the leftas viewed in the drawing and in the direction of the arrow A in FIG. 5,to move offset roller 14 toward counter pressure roller 2%. Whenelectro-magnetic means 73 is energized, lever 52 moves to the positionshown in FIG. 5 in solid lines so that offset roller 14 cooperates withmain roller 1. if the electr c-magnetic means 7%; and 31 are notenergized, spring 79 moves lever 52 to its neutral position in whichoffset roller 14 is spaced from main roller 1 and counter pressureroller 211.

FIG. 4 illustrates a modified embodiment of the offset roller. While inthe embodiment of FIG. 2, a fixed blanket is provided for the headsection of the text, and a shiftable blanket 26 for the text portion,the embodiment of FIG. 4 pnovides a blanket 60 one end of which isfixedly clamped to the periphery of the offset roller 14' by clampingmeans 61 located in a recess of the hollow offset roller 14%. Theblanket 60 is guided over rollers 62 and 64 into the interior of theoffset roller where it passes about a transporting cylinder 63 securedto a pair of arms 67 which are connected by a hollow shaft 68 turnableon shaft 15. A gear 69 is fixed to the hollow shaft or sleeve 68, andmeshes with gears 71) and 71. Gear 71 is fixed to the let-off shaft 66while gear '79 is fixed to the shaft '72., both shafts being mounted inthe end plates of offset roller 14-. A ratchet wheel 32 is held by alocking pawl 37 which is biased by spring 37. A spiral spring 33 urgesratchet wheel 32 to turn, but such turning movement is prevented by theengaged locking pawl 35. A stepping pawl 38 is mounted on shaft 39 andhas roller 42 which is located to engage the control member or members43 during rotation of offset roller 14'. During each revolution ofoffset roller 14', transporting pawl 38 will effect turning of shaft 72through one step when engaging a control member 43, and such stepwisemotion will be transmitted by gears 69, 7t 71 so that arm means 67 areturned one step with transporting roller 63 whereby the portion ofblanket 68 located on the peripheral surface of olfset roller 14'between roller 64 and 6:? is shifted one step, and a section of theblanket is pulled into the interior of otfset roll-er 14', while acorresponding section of the blanket is wound off the let-off shaft orreel 66.

Referring now to FIG. 6, which illustrates the circuit for shifting theblanket in the constructions of FIG. 2 or 4, a stationary contact means35 cooperates with the rotary contact means which is driven from gear 19on shaft 15 through a pair of gears 94 and 95 meshing with a gear 93which is secured to the shaft of the rotary contact arm 90, as best seenin FIG. 5. A series of stationary contacts 1% to corresponding to linesor parts of the text section of the printing form, and two longerstationary contacts 1&5 and 111 are mounted on the stationary contactmeans 89 so as to be successively engaged by a contact 1124- on therotary contact arm 91). A contact 1114a is connected to contact 104 andslides on a circular slide ring 1114b which is connected to a contact ofa relay 98 which also operates a contact 114. Contact 115 is connectedto electro-magnetic means 91, 81 which effect shifting of rocking lever52 to the left as viewed in FIG. 5, and to electro-magnetic means 92, 78which shift rocking lever 52 in the opposite direction. Electro-magneticmeans 81, 91 is connected to a switch 112 which is operated by thefeeding member 59 by which a copy sheet is fed to the holder 56 of thecounterpressure roller 29. Another switch 113 is also operated by thefeeding member 54.

Switches 112 and 113 are respectively connected to two series ofswitches 99 to 103 and 99a to 103a, pairs of which are simultaneouslyoperated by manually controlled selector keys T1 to T5. Switches 99a to103:; are respectively connected to the stationary contact buttons 1116to 110, while switches 99 to 1113 are respectively connected toelectro-magnetic means 83 to 87, each of which controls a control member43, which are uniformly spaced about the periphery of offset roller 14or M, and which are shifted to an operative control position located inthe path of movement of the transporting means 38, 42 when therespective electro-magnetic means 83 to 87 is energized.

A main switch TE is connected tota switch 97 of a pair of switches 97,96 having operating arms 9e41, 97a located in the path of movement ofcontact arm 90, and being operated by the same to open switch 96, and toclose the switch 97 when engaged by contact arm 91?.

The elongated contact 105 is also connected to the series of switches 9%to 1tl3a, and to switch 112, while the elongated contact 111 isconnected to the electro-magnetic means 81, 91 and 78, 92.

During rotation of contact arm 90, a circuit will be established throughany pair of manually operated selector contacts operated by depressionof a selector key T1 to T5, and a corresponding control member 43 willbe placed in its operative position.

The selector keys T1 to T5 respectively correspond to lines or parts ofthe text section of the printing form, and by operation of selectedkeys, the respective sections or parts of the printing form are selectedfor printing. Consequently, control members 43 are also respectivelyassociated with lines or parts of the text section of the printing form,and serve, by operating of transporting member 38, to place acorresponding line or part of a copy of the text section appearing onblanket 26 in the proper position for printing on the copy sheet.

The embodiments illustrated in FIGS. 1 to 6 are oper ated as follows: Atthe beginning of a printing operation, the blanket 26, or 6Q, is fullywound up on the let-off reel 48. Main roller 1 with printing form 2,offset roller 14 or 14 with blanket 26 or 60, counter pressure roller20, and contact arm 90 rotate in synchronism while rollers 1, 14 or 14',and 20 are spaced from each other.

The main switch TE is operated so that the rotary contact arm 99actuates the switches 96 and 97 by engaging actuator projections 96a and97a during rotation. Switch 96 i opened, and switch 97 is closed andconnects relay 93 to a source of voltage. Contacts 114 and 115 areshifted, and electro-magnetic means 78 is energized during the followingrevolution so that arm 52 and lever 49 are shifted to the position shownin solid lines in FIG. 5 whereby the fixed blanket portion 25 and theshiftable blanket portion 26 of offset roller 14, and the immovableblanket portion tlb and the movable blanket portion 60a of offset roller14, are engaged by the head section and by the text section of theprinting form 2 which transfer a copy of the entire printing form to thetwo blanket portions.

If the entire text of the printing form including head section and textsection is to be printed on the copy sheet, the operator shifts lever116 in the direction of the arrow C in FIG. 1, so that counter pressureroller 20 is shifted to the printing position illustrated in chain linesin FIG. 1 in which the printing form 55 thereon receives an imprint ofthe entire text from the copy on the two portions 25 and 26 of theblanket.

T hereupon, the manually operated lever means 116 is turned back in thedirection of the arrow D to the position in which the counter pressureroller 20 is spaced from the surface of the offset roller. In thismoment, the feeding member 54 is operated in a conventional manner tofeed a copy sheet 55 to the holding means 56 of the counter pressureroller which automatically ejects the old copy sheet and clamps the newcopy sheet. The feeding operation is conventional, and not an object ofthe present invention. It is only necessary that a copy sheet is fed toa position located between the surface of the counter pressure rollerand the surface of the blanket on the offset roller.

The main switch TE is released by the operator, and electro-magneticmeans 7% is de-energized so that spring '79 pulls locking lever 52 to aneutral position in which offset cylinder 14 is spaced from roller 1with printing form 2, and from counter pressure roller 26 which is againin the position shown in solid lines in FIG. 1. It is now intended toselect certain lines of the text sec tion for printing, while all otherlines of the text section of the printing form are to be omitted. Theselector keys associated with the respective selected lines aredepressed by the operator, for example, if the first two lines of thetext section are selected, keys T1 and T2 are operated so that thecorresponding switch 99, 99a and 1%, ltttla are closed.

During the above mentioned feeding of the new copy sheet 55, the feedingmember 54 closes contacts 112 and 113 so that contact 184 closes thecircuit of electro-magnetic means 81 when engaging contact 105 duringrotation of contact arm 9%. The energized electro-magnetic means 81shifts rocking lever 52 to the left in the direction of the arrow A inFIG. 5 so that offset roller 14 moves to a position in which the fixedblanket portion 25, which carries a transferred copy of the head sectionof the printing form 2, engages a corresponding portion of the copysheet 55 on counter pressure roller 26 whereby an imprint of the headsection of the printing form is made on the copy sheet.

When contact 113 closes, the circuit of the electromagnetic means 83 and84 is closed through the closed contacts 99 and 1%, and consequentlycontrol members 43 are in the operative positions located in the path ofmovement of transporting pawl 38, 42.

When contact 104 of rotary contact arm @0 successively engages thecontact buttons 196, 107, electro-magnetic means (1 is twice energizedfor a short period of time through closed switches 99a and 108a andswitch 112. Electromagnetic means 81 shifts rocking lever 52 to theposition shown in chain lines in FIG. 5 and offset roller 14 is movedtoward counter pressure roller 26 at the moment in which portions of theblanket carrying the selected lines of the transferred copy of the textsection of the printing form pass the printing line with counterpressure roller 20, and consequently corresponding imprints of theselected first and second lines are made on the copy sheet.

Upon engagement of transporting pawl 38, 42 with the operative controlmembers 43, the movable blanket is shifted two steps corresponding totwo lines of the text. The transporting pawl shifts ratchet 27 so thatthe takeup reel 27 is turned to wind up part of the blanket 26 in theconstruction of FIG. 2, while at the same time a corresponding part ofthe blanket is unwound from the leftoff reel 48. As a result, the firsttwo lines of the text section are moved off the periphery of the offsetroller, and disappear in the interior of the same. The following linesof the transferred copy on the movable blanket 26 are now in theposition to be printed.

In the embodiment of FIG. 4, a shifting of the blanket portion 6th: isaccomplished in a similar manner by turning of arm means 67 which drawsa part of the movable blanket portion 66a corresponding to the first twolines of the copy of the text thereon, into the interior of the offsetroller 69, and off the periphery of the offset roller.

In both embodiments, the immovable blanket portion 25, or etlb remainsin the same position so that the head section of the transferred copycan be used during the following revolution for making an imprint of thehead section on a copy sheet.

During the continued rotation of the contact arm 90, contact 104 passesover the elongated contact 111 after actuating switches 96 and 97,which, however, are disconnected. The engagement between contact 104 andcontact 111 closes the circuit of the electro-magnetic means 78 so thatrocking lever 52 is shifted to the right as viewed in FIG. 5, and offsetroller 14 or 14 is moved to a position cooperating with the printingform 2 so that the fixed blanket 25 engages the corresponding inked headsection of the printing form 2, and receives a fresh transferred copy ofthe head section.

Assuming that it is intended to print only the third or fifth lineduring the following printing operation, the keys T3 and T5 areactuated, and the keys T1 and T2 are cleared. Due to the shifting of themovable portion of the blanket, the portion of the movable blanketcarrying a copy of the third line will now be located adjacent theimmovable portion 25 of the blanket, and the imprint on copy sheet 55will be made directly adjacent the imprint of the head section. Sincethe blanket is again shifted after printing of the third line, theportion thereof carrying a copy of line 5 will be positioned in such away that the imprint of the fifth line will appear directly adjacent theimprint of the third line on the copy sheet 55.

The shifting of the movable blanket portion is again accomplished bycontrol members 43 which are shifted by the correspondingelectro-magnetic means and 87 9 to operative positions engaging thetransporting pawl 38 during rotation of opposite roller 14, or 14.

If all five keys T1 to T are actuated, all five lines of the textsections will be printed on the copy sheet.

If it is intended to print on each copy sheet successive lines, only onecontrol member 43 is provided and effects shifting of the movableblanket 26 after each revolution so that successive lines of the copyare located adjacent the head section which is printed by the fixedblanket portion-25. After printing of the head section, the first lineis printed during the first revolution of the offset roller while thesame is moved by electro-magnetic means 78 to the printing positioncooperating with the counter pressure roller. The copy sheet 55 may beshort since only one line is printed thereon, and consequently, aportion of the counter pressure roller 20 will not be covered by thecopy sheet, and will be engaged by the blanket. In order to prevent atransfer from the blanket to the surface of the counter pressure roller,this surface is treated so as not to accept any ink, and is, for examplechromium plated. After the printing of the first line of the textsection on the copy sheet 55, the blanket 26 is shifted by operation ofthe control member 33 which engages the transporting pawl 38.Consequently, the second line of the copy of the text on the blanket isnow located adjacent the fixed portion of the blanket which carries acopy of the head section. During the following revolution of the offsetroller, the head section, and the second line are printed in adjacentpositions on the second copy sheet which has been fed in the meantime tothe counter pressure roller. The operation is repeated until the five ormore lines of the text section are successively printed on consecutivecopy sheets adjacent the head portion. By the engagement between contact104 and contact 111, the copy of the head section on the fixed blanketportion is transferred during each revolution, while it is sutficient tomake one transferred copy of the text section on the movable portion ofthe blanket since during every revolution of the offset roller, only asingle line of the copy on the movable blanket portion is used forprinting on a single copy sheet.

When offset cylinder 14 i moved to its neutral position by operation oflever 52, and the machine is stopped, the locking pawl 35 is manuallyshifted out of engagement with the ratchet wheel 32 so that spring 33turns the same and thereby gears 23 to 31 to effect an operation of thereels 27 and 48 by which the blanket is wound back to its initialposition. After starting the machine, the automatic washing device 57 to59 cleans the blankets 25 and 26. The actuation of the locking pawl 35to release ratchet wheel 27 may be accomplished by a fixed abutment onthe frame of the machine engaged by pawl 35 when the offset roller ismoved away from counter pressure roller 20.

After the blanket has been washed, a new printing form may be attachedto the main roller 1, and the apparatus is ready for the next operation.

FIG. 7 illustrates a modified construction in which the counter pressureroller is operated by cams. As explained above, offset roller 14 remainsin a neutral position spaced from the main roller 1 and from the counterpressure roller 20 when the electro-magnetic means 78 and 81 aretie-energized. A cam shaft 129 is rotated in synchronism with therollers 1 and 20, and may be driven from gear 19 by a gear train 190,including a gear 191) on shaft 129. A cam 122 for the head portion ofthe text, and two cams 123 and 123a are mounted on shaft 129 and can beshifted on the same in axial direction so that cams 122, 123 and 123aform a composite cam track for a roller on the lever 125 which issupported for turning movement on the shaft 124. The shaft 21 of camfollower roller 20 is mounted in a slot of lever 125, and also in slotsof bearing members so that the counter pressure roller can be movedbetween a printing position 128 cooperating with the offset roller 14,and an inoperative retracted position shown in solid lines in FIG. 7. Aspring 127 urges earn follower lever against the control cams on shaft129.

When cam 122 engages the cam follower means 125, the printing form 55 onthe counter pressure roller 20 is moved into rolling engagement with theblanket portion 26 so that a head portion of the text is printed on thecopy sheet. The cam portion corresponding to the head section of thetext shifts counter pressure roller 2% to the printing position when thefixed blanket portion 25 passes the printing line between counterpressure roller 20 and offset roller 14 by placing suitable cams 123 and123a in operative position for engagingcam follower means 25, lines tobe printed can be selected. The selected lines are printed adjacent thehead section on the printing form, since the movable blanket is shiftedas explained with reference to FIGS. 2 and 4 so that after eachrevolution, the blanket portion having a copy of the respective line isin a position located adjacent the fixed blanket portion 25.

While in the above described embodiment the opposite cylinder 14 iselectrically controlled, and the counter pressure roller 20 ismechanically controlled, it is also possible to provide electro-magneticmeans for shifting the counter roller to and from its printing position,and to provide rotary cams controlling the position of the offset rollerrelative to main cylinder 1 and to the counter pressure roller.

The above described embodiments have the disadvantage that thesubstantial masses of the offset roller and of the counter pressureroller have to be shifted during the operation. In the embodimentillustrated in FIGS. 8 to 11, the counter pressure roller is eliminated,and the mass of the offset roller is reduced.

Referring now to FIGS. 8 to 10, a main roller 202 is mounted on a shaft2% and is rotated by a motor, not shown. Gears 224i, 221, 222 and 223connect shaft 267 with shaft 219 of an offset roller 218, the diameterof which is substantially half the diameter of main roller 2%..

Two moistening devices 2677 to 210, and 211 to 213 including rollers andlevers for shifting rollers 207 and 211 to a position engaging thesurface of main roller 291. are provided. An inking device 214 to 217permits the movement of roller 214 to a position for inking a printingform 202 which is secured by a holder means 2&3 to the periphery of mainroller 291. Another holder means 204 holds a copy sheet 2% on theperiphery of main roller 201. A feeding member 271 is provided forfeeding single copy sheets 205 from a stack of copy sheets to the holdermeans 224 in an automatic operation which is not an object of thepresent invention.

After a complete revolution of the main roller 201, the holder means 264may be opened in a conventional manner to permit discharge of a printedcopy sheet into a receiving pocket.

As best seen in FIG. 9, offset roller 218 is constructed similar to theoffset roller described with reference to FIG. 2. A fixed blanket 224 isheld by clamps on the corresponding peripheral surface portion of theoffset roller 218, and cooperates with the printing form 202 on the maincylinder to receive a transferred copy of the head section of the textof the printing form. A movable blanket 225 is provided for receivingtransferred copies of parts or lines of the text section of the printingform. Movable blanket 225 can be wound upon a reel or shaft 226, and iswound off a reel or shaft 247. The blanket 225 is guided over rollers245 and 246 from the interior of the hollow offset roller 218 to theperipheral surface of the offset roller. Gears 227, 230 and 229 aredriven by a gear 228 which is fixed to a shaft 233 carrying a ratchetwheel 231 under the action of a spring 232, and sprocket means 243engaging perforations in the inner portion of blanket 225 andcooperating with another transporting roller 244. A locking pawl 234holds ratchet wheel 231 against the action of spring 232 and is loadedby spring 236. A transporting pawl 237 is spring loaded by spring 239 toabut a stop 249. Roller 241 of transporting pawl 237 successivelyengages actuating members 242 when the same are in the illustratedoperative position, and is shifted by the same to turn to a position inwhich the ratchet wheel 231 is turned one step, and effectscorresponding shifting of the movable blanket 225 through one step.Shafts 2d and 47 are correspondingly turned through the gear train 228to 230. Locking pawl 234 engages ratchet wheel 231 after each step andholds the same against the action of spring 232. However, if lockingpawl 234 is held in a position releasing the ratchet wheel, spring 232will be effective to rotate the parts connectcd thereto so that theblanket 225 is again fully wound up on reel 47. The engagement betweenroller 241 and control members 242 takes place only when the offsetroller is in a neutral position spaced from the main roller 291.

A gear train 220, 254, 255 connects main roller 2G1 and its shaft 2 6with a shaft 258 on which a contact arm is mounted. As best seen in FIG.11, contact arm has a contact 256a which successively passes overcontacts 272, 274, 2'75, 279, similar contacts, not shown, and contact23%. A contact 25% on contact arm 256 slides on the slide ring 273 whichis connected to a contact 2 4 of the relay 262 which also operates acontact 263. Contact arm 256 also operates the switch 261 in the circuitof relay The manually operated main switch 266 is connected in serieswith switch 261 and is also connected to a voltage source. Switch 254 isconnected to an amplifier 265 and to a plurality of electro-magneticmeans 252, which, as best seen in FIG. 8 are mounted on a fixed frameportion 253, and operate through armatures 251 and a joint 25% asupporting lever means 248 on which shaft 219 of offset roller 218 ismounted. Supporting lever means 248 turns about a shaft 249 in the frameof the machine, and is biased by spring 267 to abut an adjustable stop2% unless an energized electromagnetic means 252 actuates supportinglever means 243 to move offset roller 218 toward main roller 201.

When offset roller 21% is retracted from main roller 2% the blanketthereon can be washed by washing device 231 to 284 when the same isshifted to an operative washing position.

Referring again to FIG. 11, the contacts 274, 275, 279 are respectivelyassociated with lines or parts of the text section of the printing form,are connected to keys T1 to T3 which are manually operated for selectingparts or lines of the text section of the printing form. Each keyoperates two switches 276a and 2761), 277a and 277b, and 278a and 27822.Switches 276a to 278a are respectively connected to electro-magneticmeans 276, 277 and 278 which operate, respectively, the control members24-2 to shift the same to an operative position located in the path ofmovement of roller 241 when the respective electro-magnetic means 276 to278 is energized.

The manually operated switches 276a to 278a are also connected to aswitch 266 which is operated by the rotary arm 25d and to a main switch285.

It is evident that the number of manually operated keys corresponds tothe number of lines or parts of the text section of the printing form,and other corresponding number of control members 242 is provided.

The printing machine illustrated in FIGS. 8 to 11 is operated in thefollowing manner: At the beginning of a printing operation, the movableblanket 225 is fully wound on a reel or shaft 24-7, and main roller 1and offset roller 18 are spaced from each other while rotatingsynchronized in such a manner that the peripheral speeds of the offsetroller and of the main roller are the same.

Assuming that it is intended to print the first two lines of the textsection of the printing form in addition to the head section, the keysT1 and T2 are actuated so that the corresponding switches 276a, 276b,277a and 2'77b close.

The main printing switch 269 is actuated and closed until contact arm256 actuates and closes switch 261 so that relay 262 is energized andopens switch 264 while closing the holding contact 263 to hold itself.The closed switch 264 closes the circuit of the electro-magneticoperating means 252 which receive a voltage from a voltage sourcethrough amplifiers 265.

The armatures 251 of electro-magnetic operating means 252 are attractedand turn through the supporting lever means 243 the offset roller 213 toa transfer position in which a copy of the head section is transferredfrom the printing form 2M; to the fixed blanket 224, and a complete copyof the entire text section of the printing form 262 is transferred tothe shiftable blanket 225.

Thereupon, arm 56 engages and operates switch 266 so that relay 62 isde-energized since the holding circuit through holding contact 263 isinterrupted. At the same time, electro-magnetic means 252 arede-energized since relay contact 264 opens. Spring means 267 becomeeffective to pull the supporting lever means 248 against stop 263 sothat the offset roller is moved to a retracted position in which theblankets are spaced from the surface of the main roller 201.

The machine is now set in a conventional manner to the printingoperation, and a copy sheet is fed by a feeding member 271 to theholding means 2%. The member 271 of the feeding means operates twoswitches 279a and 270b, as best seen in FIG. 11, which are respectivelyconnected to the manually operated switches and to the electro-magneticmeans 276 to 278. Switch 279a is also connected to the electro-magneticmeans 252.

When contact arm 256 engages with its contact 256a the long slidecontact 272, the circuit is closed through contact 256b and slide ring273, and electro-magnet means 252 are energized and move the offsetroller 218 toward the main cylinder 1 which has turned to the positionin which the first portion of the copy sheet is located opposite thefixed blanket 224 so that an imprint of the head section is made on thecopy sheet by the transferred copy on the fixed blanket 224.

During the continued turning movement of arm 256, contact 256asuccessively engages contacts 274, 275 and 279, and all other contacts,not shown which are associated with lines of the text section. Sincekeys T1 and T2 were previously operated, the corresponding selectorswitches are closed, and electro-magnetic means 276 and 277 areenergized through switches 276a and 277a, while electro-magnetic means252 are twice energized through switches 27612 and 277]) when contact256a engages contacts 274 and 275. Electro-magnetic means 252 causemovement of the offset roller to a printing position in which the firsttwo lines of the copy of the text section on blanket 225 are transferredto the copy sheet adjacent the imprint of the head section. Theenergized electro-magnetic means 276 and 277 move the control members242 to the operative position in which they are engaged by transportingpawl means 237 and 241 to shift the movable blanket 225 two steps sothat the first two lines of the copy on the movable blanket are pulledinto the interior of the offset roller, while the third line is locatedon the periphery of the offset roller adjacent the fixed blanket 224.

The surface of the main cylinder 1 is treated, for example chromiumplated, so that the exposed surface of the main cylinder, which is notcovered by copy sheet, does not receive an imprint from the unused linesof the copy on the blanket 225.

During the further turning movement of contact arm 256, contact 256aengages stationary contact 279, which has no effect since the selectorswitch T3 was not operated.

Finally, contact 256a engages contact 230, and eifects energizing ofelectro-magnetic means 252 and movement of the offset cylinder to thetransfer position in which the fixed blanket again engages the printingform in l? the region of the head section so that a fresh copy istransferred to the fixed blanket 224. The switches 261 and 265 do nothave an effect when engaged by the contact arm, since the circuitsthereof are interrupted by switch 260 and contact 263.

In the meantime, the automatic feeding member 271 has fed another copysheet 205 to the holder means 2% of the main roller 1, and the headsection is printed on the new copy sheet when contact arm 256 passes thecontact 272. During the further rotation of contact arm 256, thefollowing third and fourth lines of the text sections are printed on thenew copy sheet, since selector keys T1 and T2 remain in the position inwhich the selector switches 276a, 276b, 277a and 2771) are closed. Sincethe third and fourth lines of the transferred copy of the text sectionare now located adjacent the fixed blanket 226 on the peripheral surfaceof the offset roller, that is in the same place in which during theproceeding revolution the first two lines of the transferred copy werelocated, the third and the fourth line are now printed on the new copysheet adjacent the imprint of the head section. Of course, if only asingle key 274 would have been operated, successive single lines of thetransferred copy of the text section on blanket 225 would be printed onsuccessive copy sheet adjacent the head section.

The operation can be repeated until all lines of the text section ofprinting form 202, which were transferred as a mirror stripped copy tothe movable blanket 225', are printed on successive copy sheets 205. Itis also possible to actuate keys T1 and T3, for example, so that spacedlines are printed.

If it is desired to obtain the complete copy of the entire text, allkeys of the key board 259 are cleared, the switch 285 is closed, and thefeeding of copy sheets is started by member 271 so that theelectromagnetic operating means 252 are energized. This permits thetransfer of the entire text including head section and text section fromthe printing form 292 to the blankets 224 and 225, and a followingprinting from both blankets onto a single copy sheet 265. After theprinting operation, the offset roller 218 is again retracted from themain roller 201, and by suitable mechanical device, the locking pawl 234is operated to be withdrawn from the ratchet 231 so that the spring 232turns the shaft 226 and 247 to Wind up the movable blanket 225 to itsinitial position. At the same time, the automatic washing device 231 to23 3- is rendered operative, and cleans the blankets 224 and 225.

A new printing form 2&2 may now be attached to the main roller 201, andthe machine is ready for the next printing operation.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofsaid printing machines differing from the types described above.

While the invention has been illustrated and described as embodied in anoffset printing machine having an offset roller with a movable blanketpermitting the printing of selected lines of the text adjacent the headsection of the text, it is not intended to be limited to the detailsshown, since various modifications and structural changes may be madewithout departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form, and a copy sheet, respectively, on separateportions of said surface means; second roller means including an olfsetroller, blanket means having a peripheral portion located on theperipheral surface of said offset roller, and transporting means fortransporting said blanket means so that said peripheral portion isshifted; supporting means supporting said second roller means fortranslatory movement between a transfer position in which said first andsecond roller means cooperate for transferring a copy of said printingform to said peripheral portion of said blanket means, a printingposition in which said first and second roller means cooperate forprinting by said peripheral portion of said blanket means at least apart of said transferred copy on a copy sheet held by said secondholding means, and a neutral position in which said first and secondroller means are spaced from each other;

operating means for moving said second roller means between saidpositions; and control means for operating said transporting means aftereach revolution of said offset roller so that said blanket means isshifted and different parts of said transferred copy are printed onsuccessive copy sheets.

2. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form, and a copy sheet, respectively, on separateportions of said surface means; second roller means including a hollowoffset roller, blanket means having a peripheral portion located on theperipheral surface of said offset roller and an inner portion located inthe interior of said olfset roller, a take-up reel in the interior ofsaid offset roller for winding up said inner portion of said blanketmeans and transporting means for driving said take-up reel and fortransporting said blanket means into and out of the interior of saidofiset roller so that said peripheral portion is shifted; supportingmeans supporting said roller means for translatory movement between atransfer position in which said first and second roller means cooperatefor transferring a copy of said printing form to said peripheral portionof said blanket means, a printing position in which said first andsecond roller means cooperate for printing by said peripheral portion ofsaid blanket means at least a part of said transferred copy on a copysheet held by said second holding means, and a neutral position in whichsaid first and second roller means are spaced from each other; operatingmeans for moving said roller means between said positions; and controlmeans for operating said transporting means after each revolution ofsaid offset roller so that said blanket means is shifted and wound upand different parts of said transferred copy are printed on successivecopy sheets.

3. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, first holder means for holding aprinting form on said surface means, and second holder means for holdinga copy sheet on said surface means; second roller means including anoffset roller, blanket means having a peripheral portion located on theperipheral surface of said offset roller, and transporting means fortransporting said blanket means so that said peripheral portion isshifted different amounts; supporting means supporting said roller meansfor translatory movement between a transfer position in which said firstand second roller means cooperate for transferrin a copy of saidprinting form to said peripheral portion of said blanket means, aprinting position in which said first and second roller means cooperatefor printing by said peripheral portion of said blanket means at least apart of said transferred copy on a copy sheet, and a neutral position inwhich said first and second roller means are spaced from each other;operating means for moving said roller means between said positions; andcontrol means for operating said transporting means after eachrevolution of said ofiset roller and including a plurality of selectormembers respectively correlated with different parts of said printingform so that said blanket means is shifted and different selected partsof said transferred copy are printed during successive revolutions ofsaid second roller means on successive copy sheets spaced the samedistance from said second holder means if different selector members areactuated between successive revolutions, said control means includingmeans controlled by said selector members and connected to saidtransporting means to actuate the same to transport said blanket meansselected different amounts.

4. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form havin g a head section and a text section, and acopy sheet, respectively, on separate portions of said surface means;second roller means including an offset roller, blanket means having afirst peripheral portion fixedly secured to said offset roller and asecond peripheral portion slidable on the peripheral surface of saidoifsetroller, and transporting means for transporting said secondperipheral portion so that said second peripheral portion is shifteddifferent amounts; supporting means supporting said second roller meansfor translatory movement between a transfer position in which said firstand second roller means cooperate for transferring a copy of said headsection of said printing form to said first peripheral portion and fortransferring a copy of said text section of said printing form to saidsecond peripheral portion of said blanket means, a printing position inwhich said first and second roller means cooperate for printing by saidfirst peripheral portion said head section and for printing by saidsecond peripheral portion at least a part or line of said transferredcopy of said text section on a copy sheet held by said second holdingmeans, and a neutral position in which said first and second rollermeans are spaced from each other; operating means for moving said rollermeans between said second positions; and control means for operatingsaid transporting means after each revolution of said offset roller andincluding a plurality of selector members respectively correlated withdifferent parts of said printing form so that said blanket means isshifted and different selected partsof said text section of saidtransferred copy are printed during successive revolutions of saidsecond roller means on successive copy sheets and adjacent said headsection if different selector members are actuated between successiverevolutions, said control means including means controlled by saidselector members and connected to said transporting means to actuate thesame to transport said blanket means selected different amounts.

5. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form, and a copy sheet, respectively, on separateportions of said surface means; second roller means including an offsetroller, blanket means having a peripheral portion located on theperipheral surface of said offset roller and an inner portion located inthe interior of said offset roller, a take-up reel in the interior ofsaid offset roller for winding up said inner portion of said blanketmeans and transporting means for driving said take-up reel and fortransporting said blanket means so that said peripheral portion isshifted different, amounts, said transporting means including a steppingmechanism and an actuating member for said stepping mechanism;supporting means supporting said second roller means for translatorymovement between a transfer position in which said first and secondroller means cooperate for transferring a copy of said printing form tosaid peripheral portion of said blanket means, a printing position inwhich said first and second roller means cooperate for printing by saidperipheral portion of said blanket means at least a part of saidtransferred copy on a copy sheet held by said second holding means, anda neutral position in which said first and second roller means arespaced from each other; operating means for moving said second rollermeans between said positions; and control means including a plurality ofcontrol members individually movable to and from an operative positionfor operating said actuating member of said transporting means aftereach revolution of said offset roller so that said blanket means isshifted and wound up and different parts of said transferred copy areprinted on successive copy sheets, and selector means connected withsaid control members for selectively moving the same to said operativeposition whereby said transporting means transport said blanket meansdifferent amounts.

6. In an offset printing meachine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form, and a copy sheet, respectively, on separateportions of said surface means; second roller means including an offsetroller, blanket means having a peripheral portion located on theperipheral surface of said offset roller and an inner portion located inthe interior of said offset roller, a take-up reel in the interior ofsaid offset roller for winding up said inner portion of said blanketmeans and transporting means for driving said take-up reel and fortransporting said blanket means so that said peripheral portion isshifted, said transporting means including a spring loaded steppingmechanism and an actuating memher for said stepping mechanism;supporting means supporting said second roller means for translatorymovement between a transfer position in which said first and secondroller means cooperate for transferring a copy of said printing form tosaid peripheral portion of said blanket means, a printing position inwhich said first and second roller means cooperate for printing by saidperipheral portion of said blanket means at least a part of saidtransferred copy on a copy sheet held by said second holding means, anda neutral position in which said first and second roller means arespaced from each other; operating means for moving said second rollermeans between said positions; and control means including at least onecontrol member for operating said actuating member of said transportingmeans after each revolution of said offset roller so that said blanketmeans is shifted and wound up and different parts of said transferredcopy are printed on successive copy sheets, and means for releasing saidspring loaded stepping mechanism so that said blanket means is moved toits initial position before another printing form is used.

7. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, and first and second holder means forholding a printing form, and a copy sheet, respectively, on separateportions of said surface means; second roller means including an offsetroller, blanket means having a peripheral portion located on theperipheral surface of said offset roller, and transporting means fortransporting said blanket means so that said peripheral portion isshifted different amounts, said transporting means including means forwinding up said blanket means including a stepping mechanism having anactuating pawl; supporting means supporting said roller means fortranslatory movement between a transfer position in which said first andsecond roller means cooperate for transferring a copy of said printingform to said peripheral portion of said blanket means, a printingposition in which said first and second roller means cooperate forprinting by said peripheral portion of said blanket means at least apart of said transferred copy on a copy sheet held by said secondholding means, and a neutral position in which said first and secondroller means are spaced from each other; operating means for moving saidroller means between said positions; and control means including aplurality of control members spaced about the periphery of said offsetroller for operating said actuating member of said transporting meansafter each revolution of said offset roller and including a plurality ofselector members respectively correlated with different parts of saidprinting form and with said control members so that said blanket meansis shifted and different selected parts of said transferred copy areprinted during successive revolutions of said second roller means onsuccessive copy sheets if different selector members are actuatedbetween successive revolutions, each of said control members having aninoperative position and an operative position projecting into the pathof movement of said actuating member for operating the same duringrotation of said offset roller, said control means controlled by saidselector members including shifting means for shifting each controlmember independently of the other control member between said positions.

8. An offset printing machine as set forth in claim 7 wherein saidselector members include manually operated switches respectivelycorrelated with lines of the text section of the printing form, andkeys; and wherein said shifting means include electromagnetic meanshaving a circuit connected to said switches. I

9. An offset printing machine as set forth in claim 8 and including astationary contact member having a plurality of contact buttonsconnected with said switches, respectively, and a rotary contact armconnected to said main roller for synchronous rotation and havingcontact means successively engaging said contact buttons; wherein saidoperating means include electromagnetic operating means, and whereinsaid contact means are connected into the circuit of saidelectromagnetic operating means for energizing the same when saidcontact means engage a contact button whose associated selector switchis actuated by the, respective selector key.

10. An offset printing machine as set forth in claim 9, and includingfeeding means for feeding a copy sheet to said first roller means andincluding a feeding member movable to an operative position when feedinga copy sheet; and switch means cont olled by said feeding member in saidoperative position, and being connected to said selector switches and tosaid electromagnetic operating means so that said electromagneticoperating means are operable only after feeding of a copy sheet to saidfirst roller means.

ll. In an offset printing machine, in combination, first roller meanshaving peripheral surface means, first holder means for holding aprinting form having ahead section and a text section on said surfacemeans, and second holder means for holding a copy sheet on said surfacemeans; second roller means including an offset roller, blanket meanshaving a first peripheral portion fixedly secured to said offset rollerand a second peripheral portion slidable on the peripheral surface ofsaid offset roller, and transporting means for transporting said secondperipheral portion so that said second peripheral portion is shifteddifferent amounts, said transporting means including a steppingmechanism and an actuating member for said stepping mechanism;supporting means supporting said second roller means for translatorymovement between a transfer position in which said first and secondroller means cooperate for transferring a copy of said head section ofsaid printing form to said first peripheral portion and for transferringa copy of said text section of said printing form to said secondperipheral portion of said blanket means, a printing position in whichsaid first and second roller means cooperate for printing by said firstperipheral portion said head section and for printing by said secondperipheral portion at least a part or line of said transferred copy ofsaid text section on a copy sheet, and a neutral position in which saidfirst and second roller means are spaced from each other; operatingmeans for moving said second roller means between said positions; andcontrol means including a plurality of control members, and a pluralityof manually operable selector members respectively correlated withdifferent parts of said text section and operatively connected with saidcontrol members respectively, to actuate the same for operating saidactuating member of said transporting means after each revolution ofsaid offset roller so that said blanket means is shifted and differentsel cted parts of said transferred copy are printed during successiverevolutions of said second roller means on successive copy sheets spacedthe same distance from said second holder means if different selectormembers are actuated between successive revolutions.

12. An offset printing machine as set forth in claim 11 wherein saidoffset roller is hollow, and wherein said blanket means has an innerportion located in the interior of said offset roller, and includingwind-up means for winding up said blanket means located in the interiorof said offset rol er and driven by said stepping mechanism.

13. An offset printing machine as set forth in claim 12 wherein saidblanket means has perforations, wherein said wind-up means include atake-up reel and a let-off reel, and sprocket means for engaging saidperforations and driven by said stepping mechanism.

14. An offset printing machine as set forth in claim 12 wherein saidblanket means has one end secured to the peripheral surface of saidoffset roller and another end located in the interior of said offsetroller secured to said wind-up means; and including an arm turnable inthe interior of said offset roller and having a roll engaging said innerportion of said blanket means and forming a loop 7 in the same, said armbeing driven from said stepping mechanism to shift said secondperipheral portion of said blanket means, said first peripheral portionbeing located adjacent said secured end; and guide rollers in saidoffset roller for guiding said blanket means into and out of said offsetroller.

15. In an offset printing machine, in combination, first roller meansincluding a main roller having a peripheral surface, first holder meanson said main roller for holding a printing form on the peripheralsurface of said main roller, a counter pressure roller, and a secondholder means for holding a copy sheet on the peripheral surface of saidcounter pressure roller; second roller means including an offset roller,blanket means having a peripheral portion located on the peripheralsurface of said offset roller, and transporting means for transportingsaid blanket means so that said peripheral portion is shifted differentamounts; supporting means supporting said second roller means fortranslatory movement between a transfer position in which said mainroller and said offset roller cooperate for transferring a copy of saidprinting form to said peripheral portion of said blanket means, aprinting position in which said offset roller and said counter pressureroller cooperate for printing by said peripheral portion of said blanketmeans at least a part of said transferred copy on a copy sheet, and aneutral position in which said first and second roller means are spacedfrom each other; operating means for moving said second roller meansbetween said positions; and control means for operating saidtransporting means after each revolution of said offset roller andincluding a plurality of selector members respectively correlated withdifferent parts of said printing form so that said blanket means isshifted and different selector parts of said transferred copy areprinted during successive revolutions of said second roller means onsuccessive copy sheets if different selector members are actuatedbetween successive revolutions, said control means including meanscontrolled by said selector members and connected to said transportingmeans to actuate the same to transport said blanket means selecteddifferent amounts. I

16. In an offset printing machine, in combination, first roller meansincluding a main roller having a peripheral surface, first holder meanson said main roller for holding a printing form on one part of theperipheral surface of said main roller, and a second holder means forholding a copy sheet on another part of the peripheral surface of saidmain roller; second roller means includ-

1. IN AN OFFSET PRINTING MACHINE, IN COMBINATION, FIRST ROLLER MEANSHAVING PERIPHERAL SURFACE MEANS, AND FIRST AND SECOND HOLDER MEANS FORHOLDING A PRINTING FORM, AND A COPY SHEET, RESPECTIVELY, ON SEPARATEPORTIONS OF SAID SURFACE MEANS; SECOND ROLLER MEANS INCLUDING AN OFFSETROLLER, BLANKET MEANS HAVING A PERIPHERAL PORTION LOCATED ON THEPERIPHERAL SURFACE OF SAID OFFSET ROLLER, AND TRANSPORTING MEANS FORTRANSPORTING SAID BLANKET MEANS SO THAT SAID PERIPHERAL PORTION ISSHIFTED; SUPPORTING MEANS A SUPPORTING SAID SECOND ROLLER MEANS FORTRANSLATORY MOVEMENT BETWEEN A TRANSFER POSITION IN WHICH SAID FIRST ANDSECOND ROLLER MEANS COOPERATE FOR TRANSFERRING A COPY OF SAID PRINTINGFORM TO SAID PERIPHERAL PORTION OF SAID BLANKET MEANS, A PRINTINGPOSITION IN WHICH SAID FIRST AND SECOND ROLLER MEANS COOPERATE FORPRINTING BY SAID PERIPHERAL PORTION OF SAID BLANKET MEANS AT LEAST APART OF SAID TRANSFERRED COPY ON A COPY SHEET HELD BY SAID SECONDHOLDING MEANS, AND A NEUTRAL POSITION IN WHICH SAID FIRST AND SECONDROLLER MEANS ARE SPACED FROM EACH OTHER; OPERATING MEANS FOR MOVINGSECOND SECOND ROLLER MEANS BETWEEN SAID POSITIONS; AND CONTROL MEANS FOROPERATING SAID TRANSPORTING MEANS AFTER EACH REVOLUTION OF SAID OFFSETROLLER SO THAT SAID BLANKET MEANS IS SHIFTED AND DIFFERENT PARTS OF SAIDTRANSFERRED COPY ARE PRINTED ON SUCCESSIVE COPY SHEETS.